Sanpete County Water Intelligence Brief

August 31, 2026 | Sevier River Basin

Situation Summary

Late-season streamflow across the Sevier River Basin is holding at modest but functional levels, with Manti Creek running at 4 cfs and the Sevier River system ranging from 9 to 79 cfs across active gauges — conditions that reflect the tail end of the irrigation season for hay, alfalfa, and livestock operations in the county. Turkey producers and ranchers dependent on late-cutting alfalfa and livestock water should monitor delivery reliability closely this week as flows at several points trend stable to falling. Reservoir storage data and 7-day forecast details are available in the full brief.

Snowpack Conditions

All six SNOTEL stations serving the Sevier River Basin are reporting 0.0 inches of snow water equivalent and 0.0 inches of snow depth as of August 30 — which is the normal seasonal condition for this date, as the historical median SWE for late August is also 0.0 inches at these elevations. No below-normal snowpack signal is present in current readings.

As background context, the 2026 season was characterized by an anomalous March heat wave that drove meltout 4–6 weeks ahead of the historical median meltout date across the Mountain West, meaning the seasonal snowmelt pulse that feeds summer streamflow arrived and receded earlier than typical. That early-season dynamic is now well behind us; its downstream effect on late-summer supply is the relevant ongoing concern.

Stations reporting (all at 0.0" SWE / 0.0" depth, August 30): Beaver Dams, GBRC HQ, GBRC Meadows, Mammoth-Cottonwood, Mt. Baldy, and Thistle Flat.

Streamflow Conditions

Manti Creek below Dugway Creek, near Manti, is flowing at 4 cfs (stable) as of August 31. This is the only active USGS gauge within Sanpete County itself and serves as the primary in-county streamflow indicator. The San Pitch River mainstem has no active USGS gauge — a known data gap. Sanpete Water Conservancy District may have supplemental local monitoring data for users needing broader in-county coverage.

Sevier River Basin gauges in adjacent areas provide broader system context:

The rising signal at Kingston is the most notable current development; the cause of that uptick is not confirmed in available data. The absence of flow data at Sigurd creates a monitoring gap in the mid-basin reach. The falling trend at Lynndyl is consistent with expected late-season conditions.

Seasonal Guidance

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Data Sources: SNOTEL data through August 30, 2026; USGS streamflow data through August 31, 2026

Data Current As Of: August 31, 2026 | Utah Division of Water Rights

Important Disclaimers: This brief provides automated analysis for informational purposes only. Specific numerical claims have not been independently verified. Consult official sources including your local water district, Utah State Engineer's Office, and Utah Division of Water Rights for regulatory decisions and water rights administration.